﻿// The Nova Project by Ken Beckett.
// Copyright (C) 2007-2012 Inevitable Software, all rights reserved.
// Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php

using System.Collections.Generic;
using System.Windows;
using System.Windows.Media;

using Nova.CodeDOM;
using Expression = Nova.CodeDOM.Expression;

namespace Nova.UI
{
    /// <summary>
    /// The view model for a <see cref="CodeDOM.Unrecognized"/>.
    /// </summary>
    public class UnrecognizedVM : ExpressionVM
    {
        #region /* STATICS */

        internal static void AddViewModelMapping()
        {
            CreateViewModel.Add(typeof(Unrecognized),
                delegate(CodeObject codeObject, bool isDescription, Dictionary<CodeObject, CodeObjectVM> dictionary) { return new UnrecognizedVM((Unrecognized)codeObject, dictionary); });
        }

        #endregion

        #region /* FIELDS */

        protected ChildListVM<ExpressionVM> _expressionVMs;

        #endregion

        #region /* CONSTRUCTORS */

        /// <summary>
        /// Create a view model instance for the specified <see cref="CodeDOM.Unrecognized"/>.
        /// </summary>
        public UnrecognizedVM(Unrecognized unrecognized, Dictionary<CodeObject, CodeObjectVM> dictionary)
            : base(unrecognized, dictionary)
        {
            _expressionVMs = CreateListVM<Expression, ExpressionVM>(unrecognized.Expressions, dictionary);
        }

        #endregion

        #region /* PROPERTIES */

        /// <summary>
        /// The underlying <see cref="CodeDOM.Unrecognized"/> model.
        /// </summary>
        public Unrecognized Unrecognized
        {
            get { return (Unrecognized)CodeObject; }
        }

        /// <summary>
        /// A collection of child <see cref="ExpressionVM"/>s.
        /// </summary>
        public ChildListVM<ExpressionVM> Expressions
        {
            get { return _expressionVMs; }
        }

        #endregion

        #region /* METHODS */

        #endregion

        #region /* RENDERING */

        // Highly-noticeable background brush for Unrecognized code
        protected static LinearGradientBrush background;

        public override Brush BackgroundBrush
        {
            get
            {
                if (background == null)
                {
                    // Allocate on first use (only if needed, and also ensures creation on the UI thread)
                    background = new LinearGradientBrush(
                        new GradientStopCollection
                            {
                                new GradientStop(Colors.Black, 0.0),
                                new GradientStop(Colors.Black, 0.3),
                                new GradientStop(Colors.Yellow, 0.5),
                                new GradientStop(Colors.Yellow, 0.8),
                                new GradientStop(Colors.Black, 1.0)
                            },
                        new Point(0, 0), new Point(0.1, 0.5)) { SpreadMethod = GradientSpreadMethod.Repeat };
                }
                return (Unrecognized.InDocComment ? base.BackgroundBrush : background);
            }
        }

        public override void Render(CodeRenderer renderer, RenderFlags flags)
        {
            base.Render(renderer, flags | RenderFlags.ForceBorder | RenderFlags.NoIncreaseIndent);
        }

        public override void RenderExpression(CodeRenderer renderer, RenderFlags flags)
        {
            RenderFlags passFlags = (flags & RenderFlags.PassMask);
            renderer.RenderList(_expressionVMs, passFlags | RenderFlags.ForceBorder | RenderFlags.NoItemSeparators, this);
        }

        public override void UnRender()
        {
            ChildListHelpers.UnRender(_expressionVMs);
            base.UnRender();
        }

        #endregion
    }
}
